*{
	margin: 0;
	padding: 0;
	box-sizing: border-box;
	font-family: 'Microsoft YaHei' sans-serif;	/* 微软雅黑 */
}
/* 背景颜色 */
::selection{
	color: #000;
	background: #fff;
}
/* 导航栏 */
nav{
	position: fixed;
	background: rgba(0, 0, 0, 0.1);
	width: 100%;
	padding: 15px 100px;
	z-index: 10;/* 层级 */
}
/* 导航栏盒子 */
nav .menu{
	max-width: 1250px;
	margin: auto;
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 0 20px;
}

.menu .logo img{
	width: 30px;
	border-radius: 50%;
}
.menu .logo a{
	text-decoration: none;
	color: #fff;
	font-size: 35px;
	font-weight: 600;
}

.menu ul{
	display: inline-flex;
	justify-content: center;
	flex-wrap: wrap;
}
.menu ul li{
	list-style: none;
	margin-left: 7px;
}
.menu ul li:first-child{
	margin-left: 0px;
}
.menu ul li a{
	text-decoration: none;
	color: #fff;
	font-size: 18px;
	font-weight: 500;
	padding: 8px 15px;
	border-radius: 5px;
	transition: all 0.3s ease;
}
.menu ul li a:hover{
	background: #fff;
	color: black;
}

.img{
	background: url('../img/1.jpg') no-repeat;
	width: 100%;
	height: 100vh;
	background-size: cover;
	background-position: center;
	position: relative;
}
/* 蒙版 */
.img::before{
	content: "";
	position: absolute;
	width: 100%;
	height: 100%;
	background: rgba(0, 0, 0, 0.4);
}
.center{
	position: absolute;
	top: 52%;
	left: 50%;
	transform: translate(-50%,-50%);
	width: 100%;
	padding: 0 20px;
	text-align: center;
}

.center .photo img{
	height: 20%;
	width: 150px;
	border-radius: 50%;
}

.center .sub_title{
	color: #fff;
	font-size: 48px;
	font-weight: 600;
}

.center .btns{
	margin-top: 20px;
}

.center .btns button{
	height: 55px;
	width: 170px;
	border-radius: 5px;
	/* border: none; */
	margin: 0 10px;
	border: 2px solid white;
	font-size: 20px;
	font-weight: 500;
	padding: 0 10px;
	cursor: pointer;	/* 鼠标 手*/
	outline: none;
	transition: all 1s ease;	/* 变化 */
}

.center .btns a button:first-child{
	color: #fff;
	background: none;
}
.center .btns a button:first-child:hover{
	background: white;
	color: black;
}

.center .btns button:last-child{
	background: white;
	color: black;
}